transient fault 中文意思是什麼
transient fault
解釋
過渡故障-
There is great change of negative current component when it happens the line - open fault. it is marked as the occurrence of the fault. and it can be concluded the phase characteristic of negative current in the line. in the transient course, there are plenty of harmonics in the fault line. through the transient analysis, it is drawed that the amplitude of each harmonic in fault phase is greater than other phases. harmonic current in fault line is far greater than other normal lines
發生斷線故障以後，線路中會出現負序電流的突變，可以作為故障啟動判斷的標志，並且通過分析得出了故障時負序基波電流的相位特點。在故障暫態過程中，故障電流中含有大量豐富的諧波成分，各次諧波在故障期間有突變，並且衰減很快。 -
New designed auto tracing arc eliminating device based on this technique contents more technology, which has sample circuit, wide tuning scope, quick response and low noise. this paper firstly introduces neutral grounding histroy. by analyzing the syntony grounding theory, the transient and stable process of one - phase grounding fault, the threaten to secure run of power system and the importance of exact compensation for capacitive current are cognized
論文中首先介紹了中性點接地方式的發展過程，通過對諧振接地原理和單相接地故障的暫態、穩態分析，認識到接地故障對系統安全運行的危害，通過消弧線圈對接地電容電流的迅速準確補償是減小故障危害的最主要手段。 -
Transient simulation of tri - winding single phase motors with wye - connected during fault operation
三繞組單相電動機故障運行瞬態過程模擬研究 -
In the second method, wavelet transform is combined with modal transform, and transient travelling - wave signal is used. after three phase signals are decomposed into their modal components, the wavelet transform coefficient of ground mode can be used to identify approximate position of fault, and the wavelet transform coefficient of aerial mode is used for identifying arrival time of traveling - wave
第二種方法將小波變換與模式變換理論結合起來，採用的是暫態行波信號，首先將三相信號轉換成模式分量，零模分量的小波變換系數用於判別故障的大致位置，然後利用線模分量的小波變換系數來確定行波到達時間。 -
This paper researches the non - direct - grounded system fault detection from software arithmetic view, whose main content is as follows : the paper analyses the system running characters before and after fault. and the paper analyses the fault transient signal and fault steady signal and all parts in fault steady signal after the single line - to - earth fault occurs, and discovers the fault laws and appearance of fault signal. the analyzing of the fault laws and fault phenomenon of non - direct - grounded system all above is the base of analyzing arithmetic
本文針對小電流接地系統選線的問題，從軟體演算法的角度進行了研究，主要內容如下：對小電流接地系統故障前和故障后系統的運行特點進行了分析，並且對小電流接地系統發生單相接地故障后，故障暫態信號、故障穩態信號以及故障穩態信號的各種成分進行了深入的分析，找到了故障的規律以及其故障信號的表現形式，為對各種演算法的分析比較打下了基礎。 -
The stability of electric power system has been being focused for a long time toprevent a power system from losing synchronism after sudden fault ， researchers have done much work and got many accomplishments this paper applied the direct feedback linearization ( dfl ) technique on the power system ， a strong nonlinear system simulation results by matlab proved this method efficiency main works and results are as follows ： this paper compared some existing methods in excitation control ， fast valve control and coordinated control respectively, analyzed the developments and actuality of nonlinear control research in brief, illustrated why ransient stability could be greatly improved by using the fast valve control in chapter 3 ， indicated the importance of coordinated control farther this paper introduced the inverse system theory, based on which ， discussed the dfl theory, pointed out which had consistency with the inverse theory, expanded the dfl theory combined the idiographic model equations ， made which adapt to the model of a single machine - infinite bus power system this paper referenced abundance articles and educed a set of equations ， which could describe the dynamical process of excitation and fast valve control for synchronous generators in the equations ， there were several very important parameters of power system - - rotor angle ( ) ， rotor speed ( ) ， generator q axis voltage ( eq ) ， transient voltage ( e ' q ) ， active power ( pe ) ， mechanical input power ( pm ) ， valve opening ( ) ， generator terminal voltage ( vt ) ， based on the model ， nonlinear coordinated controller and terminal voltage optimal controller have been designed by using the expanded dfl theory and lq optimal control theory the simulation results showed that the controller could keep power system transiently stable under the effects of a symmetrical 3 - phase short circuit fault ， which achieved better postfault regulation compared with another two routine methods ， one is the proportion excitation controller and proportion fast valve controller, the other is the proportion excitation controller and the optimal fast valve controller, which could exert good performance when met 1ittle disturbance either
在介紹逆系統理論的基礎上，詳細介紹了dfl理論，通過比較闡明了dfl理論其本質是逆系統方法的一類，並結合具體課題推導出的模型方程將dfl理論進行了擴展，使之適應于電力系統這個強非線性對象。通過參考大量的書籍文獻推導出一套實用的可將大型汽輪發電機勵磁與汽門綜合起來進行控制的模型方程，此模型方程涵蓋了電力系統中特別引人注目的幾個量- -轉子角、轉子轉速、發電機q軸電勢eq 、暫態電勢e ' q 、有功功率pe 、機械功率pm 、汽門開度、機端電壓vt ，在此基礎上建立了實用的電力系統簡化的數學模型，並將擴展的dfl理論應用於此模型系統，結合線性二次型最優控制理論設計出大型汽輪發電機的非線性綜合控制器及機端電壓最優控制器，通過模擬實驗與採用常規的按電壓偏差進行調節的比例式勵磁控制器+汽門比例控制及採用常規的按電壓偏差進行調節的比例式勵磁調節器和基於二次型性能指標設計的最優快控汽門（考慮發電機的飽和因素）進行了對比，證實了採用此種控制器可以有效地提高電力系統的暫態穩定性，並且在電力系統遭受小干擾時同樣具有良好的調節性能。 -
It includes four criterions of locating fault point ? “ transient zero sequence current amplitude law ”, “ stable base wave zero sequence current phase law ”, “ stable seventh harmonic zero sequence current phase law ” and “ s injection law ”. pointing out how the law locate the fault point to minimal fault section by applying these criterions gradually. the law will not only make up the blemishes existing in current methods for single - phase fault location in small current grounding system, but also locate the fault point to minimal fault isolating unit on fault line
該方法通過將所包含的四個定位判據- 「暫態零序電流幅值法」 、 「穩態基波零序電流方向法」 、 「穩態7次諧波零序電流方向法」和「 s信號注入法」 -進行有選擇地遞進使用，不僅有效彌補了目前已有小電流接地系統單相接地故障選線的缺陷，更將故障定位在故障線路最小故障區段。 -
The transient simulation of stator winding inter - turn short circuit fault has been completed successfully based on the multi - loop mathematical model
基於神經網路技術，提出了以定子負序導納平均值作為故障特徵量的異步電動機定子繞組匝間短路故障檢測方法。 -
This paper analyses the test results gained by mixed simulation, and validates the reliability of the use of transient zero current and negative current in fault identifying
文中討論了負序電流的分佈及提取問題，試驗數據同樣表明負序電流用於單相接地故障識別是可行性的。 -
For the severe limitation that the selectivity of transient current protection will lose when the fault with small resistance or without resistance takes place at the end of transmission line, the basic reason for the selectivity loss of transient current protection was investigated
摘要針對保護出口處發生金屬性或小電阻短路故障時，暫態電流保護完全失去選擇性的嚴重缺陷，利用時域分析方法，進行了詳細的故障暫態分析和模擬研究。 -
It combines feeder automation, and develops the fault identifying principle from one direction to two direction. so it enhances the redundancy of fault information, and improves the reliability of the fault location. we choose the transient zero current prior to others, for it is bigger than others mostly
本文敘述了饋線系統保護原理，提出了基於饋線自動化系統的幾種單相接地故障處理方案，討論了這幾種方案下故障特徵量的比較方式，分析了故障特徵量選用的出發點以及配電終端地址命名規則等問題。 -
The author studies the prolems of principle and criterion of transient protection based on fault current, and gives a new scheme of tranisent protection
提出了基於統計分析的高壓電網故障暫態信號處理的原理與演算法。 -
Based on the relative theories about electric circuit and synchronous generators " post - fault transient, a practical computerized method making use of node impedance matrix is proposed to calculate the instantaneous currents of a faulty power system
本文基於電路理論和發電機的短路過渡過程理論，利用節點阻抗陣推導出電力系統短路時任意時刻短路電流的實用計算機演算法。 -
On the basis of extensive reading and research of theory of the wavelet, it is presented a practical method based on odd theory of wavelet analysis to remove the white noises from transient fault current traveling waves of high voltage transmission line via multi - size analysis of wavelet
本文在廣泛閱讀和深入研究小波理論的基礎上，論文提出了一種基於小波分析的奇異性理論對通過小波多尺度變換的高壓輸電線路故障電流暫態行波信號進行白噪聲濾除的實用方法。 -
Calculation and analysis for transient fault component current
暫態故障分量電流的計算分析 -
The characteristic of its hardware is the high speed sampling technology adopted for recording transient fault information ; the characteristic of its software is the design of the platform used for transient signal analysis and the combined fault location algorithm
硬體方案的主要特點是設計了暫態量採集系統，軟體方案的主要特點是設計了暫態信號的分析平臺並實現了組合故障測距演算法。 -
Judging by the different magnitude and direction of the wavelet packet coefficient modular maximum, we can select the single phase - to - earth line. the method using wavelet singularity detection theory to extract the fault time is discussed. a fault distance measurement algorithm combining wavelet analysis used for separating the character from the transient fault signal with artificial neural networks used for the nonlinear approximation from the transient character to fault distance is presented
論文提出利用各個出線零序電流在頻帶上小波包系數模極大值的方向和大小的不同來實現故障選線，討論了利用小波分析的奇異性來判斷故障啟動時刻，提出將小波分析和人工神經網路結合，利用人工神經網路的非線性逼近能力，實現故障暫態量到故障距離的非線性映射，完成測距。 -
The simulation result shows that using wavelet packet analysis to separate the character from the transient fault signals is an efficient way
模擬結果表明：利用小波包分析理論對電力系統故障暫態信號特徵提取處理是行之有效的方法。 -
In spite of the limited samples, the simulation result shows that using wavelet analysis to separate the character from the transient fault signals is an efficient way
盡管本論文中選擇的模擬算例針對的情況有限，但是模擬結果表明：利用小波分析理論對電力系統故障暫態信號進行特徵提取處理是行之有效的方法。 -
This method uses wavelet transform to pick up the transient fault information because of its multi - resolution characteristics and time - frequency localization nature. fault line is detected based on the modulus maxima or energy comparison under some scale of wavelet transform of phase currents or component current. this method is applicable for such power system as only furnished with ct on two phases, so the shortcoming of other methods presented in recent years is overcome
即利用相應出線相電流或分量的暫態信息突變量在小波變換某一尺度下模極大值或能量比較來確定故障線路，該方法同樣適用於只裝設兩相ct的小電流接地系統，從而克服了迄今為止提出的一些選線方法在系統只裝設兩相ct時失效的問題。
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